HYDRAULICS. ENGINEERING HYDROLOGY. HYDRAULIC ENGINEERING

IMPACT OF DEFORMABILITY OF MATERIAL OF SEEPAGE-CONTROL DIAPHRAGM INSTALLED IN EARTHFILL DAM USING THE CUT-OFF WALL METHOD ON STRENGTH OF THE MATERIAL

Vestnik MGSU 2/2017 Volume 12
  • Sainov Mikhail Petrovich - Moscow State University of Civil Engineering (National Research University) (MGSU) Candidate of Technical Sciences, Associate Professor, Department of Hydraulic and Hydraulic Engineering, Moscow State University of Civil Engineering (National Research University) (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation.
  • Kudryavtsev Grigoriy Mikhaylovich - Moscow State University of Civil Engineering (National Research University) (MGSU) Assistant, Department of Hydraulics and Hydraulic Engineering, Moscow State University of Civil Engineering (National Research University) (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation.

Pages 214-221

In design of hydraulic structures seepage-control components are used; for installation thereof the cut-off wall method is often applied. Previous studies demonstrated that the reliable operation of the wall (diaphragm) depends much on properties of the material of which it is made. The article considers the results of calculations of stress-strain state of the earth dam 39 m of height, with the seepage-control component in a form of a diaphragm installed using the cut-off wall method. During the research the properties of the wall material varied. It was revealed in the course of works that tensile stresses resulting from bending strains when the wall takes on the hydrostatic pressure are of serious hazard to the diaphragm. Such stresses are problematic for designs of seepage-control diaphragms (cut-off walls) in earth dams made of stiff materials. The more stiff the material the higher the risk of showing of tensile stresses. When using the material with the deformation modulus less than 1000 MPa the tensile stresses do not show because they are compensated by compression under action of the wall’s own weight. If a reinforced concrete is used as the wall material, the appearing tensile stresses will exceed the tensile strength of the reinforced concrete and will not be able to be taken even by reinforcing bars. It is recommended to use clay cement concrete with the deformation modulus not higher than 1000 MPa. It was concluded that a non-ground diaphragm installed in the earth dam body using the cut-off wall method can be a reliable seepage-control component because it is installed after the dam construction completion and does not exercise significant deformations from ground fill settlements. A stress-strain state of the thin-walled non-ground diaphragm in the earth dam body is determined by deformations of the fill containing it. Intrinsic wall stiffness influences weakly on the stress-strain state of the earth dam.

DOI: 10.22227/1997-0935.2017.2.214-221

Download

Results 1 - 1 of 1